fs/9p/vfs_file.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  linux/fs/9p/vfs_file.c
   4  *
   5  * This file contians vfs file ops for 9P2000.
   6  *
   7  *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
   8  *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/errno.h>
  13 #include <linux/fs.h>
  14 #include <linux/sched.h>
  15 #include <linux/file.h>
  16 #include <linux/stat.h>
  17 #include <linux/string.h>
  18 #include <linux/inet.h>
  19 #include <linux/list.h>
  20 #include <linux/pagemap.h>
  21 #include <linux/utsname.h>
  22 #include <linux/uaccess.h>
  23 #include <linux/idr.h>
  24 #include <linux/uio.h>
  25 #include <linux/slab.h>
  26 #include <net/9p/9p.h>
  27 #include <net/9p/client.h>
  28
  29 #include "v9fs.h"
  30 #include "v9fs_vfs.h"
  31 #include "fid.h"
  32 #include "cache.h"
  33
  34 static const struct vm_operations_struct v9fs_file_vm_ops;
  35 static const struct vm_operations_struct v9fs_mmap_file_vm_ops;
  36
  37 /**
  38  * v9fs_file_open - open a file (or directory)
  39  * @inode: inode to be opened
  40  * @file: file being opened
  41  *
  42  */
  43
  44 int v9fs_file_open(struct inode *inode, struct file *file)
  45 {
  46         int err;
  47         struct v9fs_inode *v9inode;
  48         struct v9fs_session_info *v9ses;
  49         struct p9_fid *fid;
  50         int omode;
  51
  52         p9_debug(P9_DEBUG_VFS, "inode: %p file: %p\n", inode, file);
  53         v9inode = V9FS_I(inode);
  54         v9ses = v9fs_inode2v9ses(inode);
  55         if (v9fs_proto_dotl(v9ses))
  56                 omode = v9fs_open_to_dotl_flags(file->f_flags);
  57         else
  58                 omode = v9fs_uflags2omode(file->f_flags,
  59                                         v9fs_proto_dotu(v9ses));
  60         fid = file->private_data;
  61         if (!fid) {
  62                 fid = v9fs_fid_clone(file_dentry(file));
  63                 if (IS_ERR(fid))
  64                         return PTR_ERR(fid);
  65
  66                 err = p9_client_open(fid, omode);
  67                 if (err < 0) {
  68                         p9_client_clunk(fid);
  69                         return err;
  70                 }
  71                 if ((file->f_flags & O_APPEND) &&
  72                         (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)))
  73                         generic_file_llseek(file, 0, SEEK_END);
  74         }
  75
  76         file->private_data = fid;
  77         mutex_lock(&v9inode->v_mutex);
  78         if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) &&
  79             !v9inode->writeback_fid &&
  80             ((file->f_flags & O_ACCMODE) != O_RDONLY)) {
  81                 /*
  82                  * clone a fid and add it to writeback_fid
  83                  * we do it during open time instead of
  84                  * page dirty time via write_begin/page_mkwrite
  85                  * because we want write after unlink usecase
  86                  * to work.
  87                  */
  88                 fid = v9fs_writeback_fid(file_dentry(file));
  89                 if (IS_ERR(fid)) {
  90                         err = PTR_ERR(fid);
  91                         mutex_unlock(&v9inode->v_mutex);
  92                         goto out_error;
  93                 }
  94                 v9inode->writeback_fid = (void *) fid;
  95         }
  96         mutex_unlock(&v9inode->v_mutex);
  97         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
  98                 v9fs_cache_inode_set_cookie(inode, file);
  99         return 0;
 100 out_error:
 101         p9_client_clunk(file->private_data);
 102         file->private_data = NULL;
 103         return err;
 104 }
 105
 106 /**
 107  * v9fs_file_lock - lock a file (or directory)
 108  * @filp: file to be locked
 109  * @cmd: lock command
 110  * @fl: file lock structure
 111  *
 112  * Bugs: this looks like a local only lock, we should extend into 9P
 113  *       by using open exclusive
 114  */
 115
 116 static int v9fs_file_lock(struct file *filp, int cmd, struct file_lock *fl)
 117 {
 118         int res = 0;
 119         struct inode *inode = file_inode(filp);
 120
 121         p9_debug(P9_DEBUG_VFS, "filp: %p lock: %p\n", filp, fl);
 122
 123         /* No mandatory locks */
 124         if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
 125                 return -ENOLCK;
 126
 127         if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) {
 128                 filemap_write_and_wait(inode->i_mapping);
 129                 invalidate_mapping_pages(&inode->i_data, 0, -1);
 130         }
 131
 132         return res;
 133 }
 134
 135 static int v9fs_file_do_lock(struct file *filp, int cmd, struct file_lock *fl)
 136 {
 137         struct p9_flock flock;
 138         struct p9_fid *fid;
 139         uint8_t status = P9_LOCK_ERROR;
 140         int res = 0;
 141         unsigned char fl_type;
 142         struct v9fs_session_info *v9ses;
 143
 144         fid = filp->private_data;
 145         BUG_ON(fid == NULL);
 146
 147         if ((fl->fl_flags & FL_POSIX) != FL_POSIX)
 148                 BUG();
 149
 150         res = locks_lock_file_wait(filp, fl);
 151         if (res < 0)
 152                 goto out;
 153
 154         /* convert posix lock to p9 tlock args */
 155         memset(&flock, 0, sizeof(flock));
 156         /* map the lock type */
 157         switch (fl->fl_type) {
 158         case F_RDLCK:
 159                 flock.type = P9_LOCK_TYPE_RDLCK;
 160                 break;
 161         case F_WRLCK:
 162                 flock.type = P9_LOCK_TYPE_WRLCK;
 163                 break;
 164         case F_UNLCK:
 165                 flock.type = P9_LOCK_TYPE_UNLCK;
 166                 break;
 167         }
 168         flock.start = fl->fl_start;
 169         if (fl->fl_end == OFFSET_MAX)
 170                 flock.length = 0;
 171         else
 172                 flock.length = fl->fl_end - fl->fl_start + 1;
 173         flock.proc_id = fl->fl_pid;
 174         flock.client_id = fid->clnt->name;
 175         if (IS_SETLKW(cmd))
 176                 flock.flags = P9_LOCK_FLAGS_BLOCK;
 177
 178         v9ses = v9fs_inode2v9ses(file_inode(filp));
 179
 180         /*
 181          * if its a blocked request and we get P9_LOCK_BLOCKED as the status
 182          * for lock request, keep on trying
 183          */
 184         for (;;) {
 185                 res = p9_client_lock_dotl(fid, &flock, &status);
 186                 if (res < 0)
 187                         goto out_unlock;
 188
 189                 if (status != P9_LOCK_BLOCKED)
 190                         break;
 191                 if (status == P9_LOCK_BLOCKED && !IS_SETLKW(cmd))
 192                         break;
 193                 if (schedule_timeout_interruptible(v9ses->session_lock_timeout)
 194                                 != 0)
 195                         break;
 196                 /*
 197                  * p9_client_lock_dotl overwrites flock.client_id with the
 198                  * server message, free and reuse the client name
 199                  */
 200                 if (flock.client_id != fid->clnt->name) {
 201                         kfree(flock.client_id);
 202                         flock.client_id = fid->clnt->name;
 203                 }
 204         }
 205
 206         /* map 9p status to VFS status */
 207         switch (status) {
 208         case P9_LOCK_SUCCESS:
 209                 res = 0;
 210                 break;
 211         case P9_LOCK_BLOCKED:
 212                 res = -EAGAIN;
 213                 break;
 214         default:
 215                 WARN_ONCE(1, "unknown lock status code: %d\n", status);
 216                 /* fall through */
 217         case P9_LOCK_ERROR:
 218         case P9_LOCK_GRACE:
 219                 res = -ENOLCK;
 220                 break;
 221         }
 222
 223 out_unlock:
 224         /*
 225          * incase server returned error for lock request, revert
 226          * it locally
 227          */
 228         if (res < 0 && fl->fl_type != F_UNLCK) {
 229                 fl_type = fl->fl_type;
 230                 fl->fl_type = F_UNLCK;
 231                 /* Even if this fails we want to return the remote error */
 232                 locks_lock_file_wait(filp, fl);
 233                 fl->fl_type = fl_type;
 234         }
 235         if (flock.client_id != fid->clnt->name)
 236                 kfree(flock.client_id);
 237 out:
 238         return res;
 239 }
 240
 241 static int v9fs_file_getlock(struct file *filp, struct file_lock *fl)
 242 {
 243         struct p9_getlock glock;
 244         struct p9_fid *fid;
 245         int res = 0;
 246
 247         fid = filp->private_data;
 248         BUG_ON(fid == NULL);
 249
 250         posix_test_lock(filp, fl);
 251         /*
 252          * if we have a conflicting lock locally, no need to validate
 253          * with server
 254          */
 255         if (fl->fl_type != F_UNLCK)
 256                 return res;
 257
 258         /* convert posix lock to p9 tgetlock args */
 259         memset(&glock, 0, sizeof(glock));
 260         glock.type  = P9_LOCK_TYPE_UNLCK;
 261         glock.start = fl->fl_start;
 262         if (fl->fl_end == OFFSET_MAX)
 263                 glock.length = 0;
 264         else
 265                 glock.length = fl->fl_end - fl->fl_start + 1;
 266         glock.proc_id = fl->fl_pid;
 267         glock.client_id = fid->clnt->name;
 268
 269         res = p9_client_getlock_dotl(fid, &glock);
 270         if (res < 0)
 271                 goto out;
 272         /* map 9p lock type to os lock type */
 273         switch (glock.type) {
 274         case P9_LOCK_TYPE_RDLCK:
 275                 fl->fl_type = F_RDLCK;
 276                 break;
 277         case P9_LOCK_TYPE_WRLCK:
 278                 fl->fl_type = F_WRLCK;
 279                 break;
 280         case P9_LOCK_TYPE_UNLCK:
 281                 fl->fl_type = F_UNLCK;
 282                 break;
 283         }
 284         if (glock.type != P9_LOCK_TYPE_UNLCK) {
 285                 fl->fl_start = glock.start;
 286                 if (glock.length == 0)
 287                         fl->fl_end = OFFSET_MAX;
 288                 else
 289                         fl->fl_end = glock.start + glock.length - 1;
 290                 fl->fl_pid = -glock.proc_id;
 291         }
 292 out:
 293         if (glock.client_id != fid->clnt->name)
 294                 kfree(glock.client_id);
 295         return res;
 296 }
 297
 298 /**
 299  * v9fs_file_lock_dotl - lock a file (or directory)
 300  * @filp: file to be locked
 301  * @cmd: lock command
 302  * @fl: file lock structure
 303  *
 304  */
 305
 306 static int v9fs_file_lock_dotl(struct file *filp, int cmd, struct file_lock *fl)
 307 {
 308         struct inode *inode = file_inode(filp);
 309         int ret = -ENOLCK;
 310
 311         p9_debug(P9_DEBUG_VFS, "filp: %p cmd:%d lock: %p name: %pD\n",
 312                  filp, cmd, fl, filp);
 313
 314         /* No mandatory locks */
 315         if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
 316                 goto out_err;
 317
 318         if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) {
 319                 filemap_write_and_wait(inode->i_mapping);
 320                 invalidate_mapping_pages(&inode->i_data, 0, -1);
 321         }
 322
 323         if (IS_SETLK(cmd) || IS_SETLKW(cmd))
 324                 ret = v9fs_file_do_lock(filp, cmd, fl);
 325         else if (IS_GETLK(cmd))
 326                 ret = v9fs_file_getlock(filp, fl);
 327         else
 328                 ret = -EINVAL;
 329 out_err:
 330         return ret;
 331 }
 332
 333 /**
 334  * v9fs_file_flock_dotl - lock a file
 335  * @filp: file to be locked
 336  * @cmd: lock command
 337  * @fl: file lock structure
 338  *
 339  */
 340
 341 static int v9fs_file_flock_dotl(struct file *filp, int cmd,
 342         struct file_lock *fl)
 343 {
 344         struct inode *inode = file_inode(filp);
 345         int ret = -ENOLCK;
 346
 347         p9_debug(P9_DEBUG_VFS, "filp: %p cmd:%d lock: %p name: %pD\n",
 348                  filp, cmd, fl, filp);
 349
 350         /* No mandatory locks */
 351         if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
 352                 goto out_err;
 353
 354         if (!(fl->fl_flags & FL_FLOCK))
 355                 goto out_err;
 356
 357         if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) {
 358                 filemap_write_and_wait(inode->i_mapping);
 359                 invalidate_mapping_pages(&inode->i_data, 0, -1);
 360         }
 361         /* Convert flock to posix lock */
 362         fl->fl_flags |= FL_POSIX;
 363         fl->fl_flags ^= FL_FLOCK;
 364
 365         if (IS_SETLK(cmd) | IS_SETLKW(cmd))
 366                 ret = v9fs_file_do_lock(filp, cmd, fl);
 367         else
 368                 ret = -EINVAL;
 369 out_err:
 370         return ret;
 371 }
 372
 373 /**
 374  * v9fs_file_read - read from a file
 375  * @filp: file pointer to read
 376  * @udata: user data buffer to read data into
 377  * @count: size of buffer
 378  * @offset: offset at which to read data
 379  *
 380  */
 381
 382 static ssize_t
 383 v9fs_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
 384 {
 385         struct p9_fid *fid = iocb->ki_filp->private_data;
 386         int ret, err = 0;
 387
 388         p9_debug(P9_DEBUG_VFS, "count %zu offset %lld\n",
 389                  iov_iter_count(to), iocb->ki_pos);
 390
 391         if (iocb->ki_filp->f_flags & O_NONBLOCK)
 392                 ret = p9_client_read_once(fid, iocb->ki_pos, to, &err);
 393         else
 394                 ret = p9_client_read(fid, iocb->ki_pos, to, &err);
 395         if (!ret)
 396                 return err;
 397
 398         iocb->ki_pos += ret;
 399         return ret;
 400 }
 401
 402 /**
 403  * v9fs_file_write - write to a file
 404  * @filp: file pointer to write
 405  * @data: data buffer to write data from
 406  * @count: size of buffer
 407  * @offset: offset at which to write data
 408  *
 409  */
 410 static ssize_t
 411 v9fs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
 412 {
 413         struct file *file = iocb->ki_filp;
 414         ssize_t retval;
 415         loff_t origin;
 416         int err = 0;
 417
 418         retval = generic_write_checks(iocb, from);
 419         if (retval <= 0)
 420                 return retval;
 421
 422         origin = iocb->ki_pos;
 423         retval = p9_client_write(file->private_data, iocb->ki_pos, from, &err);
 424         if (retval > 0) {
 425                 struct inode *inode = file_inode(file);
 426                 loff_t i_size;
 427                 unsigned long pg_start, pg_end;
 428                 pg_start = origin >> PAGE_SHIFT;
 429                 pg_end = (origin + retval - 1) >> PAGE_SHIFT;
 430                 if (inode->i_mapping && inode->i_mapping->nrpages)
 431                         invalidate_inode_pages2_range(inode->i_mapping,
 432                                                       pg_start, pg_end);
 433                 iocb->ki_pos += retval;
 434                 i_size = i_size_read(inode);
 435                 if (iocb->ki_pos > i_size) {
 436                         inode_add_bytes(inode, iocb->ki_pos - i_size);
 437                         /*
 438                          * Need to serialize against i_size_write() in
 439                          * v9fs_stat2inode()
 440                          */
 441                         v9fs_i_size_write(inode, iocb->ki_pos);
 442                 }
 443                 return retval;
 444         }
 445         return err;
 446 }
 447
 448 static int v9fs_file_fsync(struct file *filp, loff_t start, loff_t end,
 449                            int datasync)
 450 {
 451         struct p9_fid *fid;
 452         struct inode *inode = filp->f_mapping->host;
 453         struct p9_wstat wstat;
 454         int retval;
 455
 456         retval = file_write_and_wait_range(filp, start, end);
 457         if (retval)
 458                 return retval;
 459
 460         inode_lock(inode);
 461         p9_debug(P9_DEBUG_VFS, "filp %p datasync %x\n", filp, datasync);
 462
 463         fid = filp->private_data;
 464         v9fs_blank_wstat(&wstat);
 465
 466         retval = p9_client_wstat(fid, &wstat);
 467         inode_unlock(inode);
 468
 469         return retval;
 470 }
 471
 472 int v9fs_file_fsync_dotl(struct file *filp, loff_t start, loff_t end,
 473                          int datasync)
 474 {
 475         struct p9_fid *fid;
 476         struct inode *inode = filp->f_mapping->host;
 477         int retval;
 478
 479         retval = file_write_and_wait_range(filp, start, end);
 480         if (retval)
 481                 return retval;
 482
 483         inode_lock(inode);
 484         p9_debug(P9_DEBUG_VFS, "filp %p datasync %x\n", filp, datasync);
 485
 486         fid = filp->private_data;
 487
 488         retval = p9_client_fsync(fid, datasync);
 489         inode_unlock(inode);
 490
 491         return retval;
 492 }
 493
 494 static int
 495 v9fs_file_mmap(struct file *filp, struct vm_area_struct *vma)
 496 {
 497         int retval;
 498
 499
 500         retval = generic_file_mmap(filp, vma);
 501         if (!retval)
 502                 vma->vm_ops = &v9fs_file_vm_ops;
 503
 504         return retval;
 505 }
 506
 507 static int
 508 v9fs_mmap_file_mmap(struct file *filp, struct vm_area_struct *vma)
 509 {
 510         int retval;
 511         struct inode *inode;
 512         struct v9fs_inode *v9inode;
 513         struct p9_fid *fid;
 514
 515         inode = file_inode(filp);
 516         v9inode = V9FS_I(inode);
 517         mutex_lock(&v9inode->v_mutex);
 518         if (!v9inode->writeback_fid &&
 519             (vma->vm_flags & VM_SHARED) &&
 520             (vma->vm_flags & VM_WRITE)) {
 521                 /*
 522                  * clone a fid and add it to writeback_fid
 523                  * we do it during mmap instead of
 524                  * page dirty time via write_begin/page_mkwrite
 525                  * because we want write after unlink usecase
 526                  * to work.
 527                  */
 528                 fid = v9fs_writeback_fid(file_dentry(filp));
 529                 if (IS_ERR(fid)) {
 530                         retval = PTR_ERR(fid);
 531                         mutex_unlock(&v9inode->v_mutex);
 532                         return retval;
 533                 }
 534                 v9inode->writeback_fid = (void *) fid;
 535         }
 536         mutex_unlock(&v9inode->v_mutex);
 537
 538         retval = generic_file_mmap(filp, vma);
 539         if (!retval)
 540                 vma->vm_ops = &v9fs_mmap_file_vm_ops;
 541
 542         return retval;
 543 }
 544
 545 static vm_fault_t
 546 v9fs_vm_page_mkwrite(struct vm_fault *vmf)
 547 {
 548         struct v9fs_inode *v9inode;
 549         struct page *page = vmf->page;
 550         struct file *filp = vmf->vma->vm_file;
 551         struct inode *inode = file_inode(filp);
 552
 553
 554         p9_debug(P9_DEBUG_VFS, "page %p fid %lx\n",
 555                  page, (unsigned long)filp->private_data);
 556
 557         /* Update file times before taking page lock */
 558         file_update_time(filp);
 559
 560         v9inode = V9FS_I(inode);
 561         /* make sure the cache has finished storing the page */
 562         v9fs_fscache_wait_on_page_write(inode, page);
 563         BUG_ON(!v9inode->writeback_fid);
 564         lock_page(page);
 565         if (page->mapping != inode->i_mapping)
 566                 goto out_unlock;
 567         wait_for_stable_page(page);
 568
 569         return VM_FAULT_LOCKED;
 570 out_unlock:
 571         unlock_page(page);
 572         return VM_FAULT_NOPAGE;
 573 }
 574
 575 /**
 576  * v9fs_mmap_file_read - read from a file
 577  * @filp: file pointer to read
 578  * @data: user data buffer to read data into
 579  * @count: size of buffer
 580  * @offset: offset at which to read data
 581  *
 582  */
 583 static ssize_t
 584 v9fs_mmap_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
 585 {
 586         /* TODO: Check if there are dirty pages */
 587         return v9fs_file_read_iter(iocb, to);
 588 }
 589
 590 /**
 591  * v9fs_mmap_file_write - write to a file
 592  * @filp: file pointer to write
 593  * @data: data buffer to write data from
 594  * @count: size of buffer
 595  * @offset: offset at which to write data
 596  *
 597  */
 598 static ssize_t
 599 v9fs_mmap_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
 600 {
 601         /*
 602          * TODO: invalidate mmaps on filp's inode between
 603          * offset and offset+count
 604          */
 605         return v9fs_file_write_iter(iocb, from);
 606 }
 607
 608 static void v9fs_mmap_vm_close(struct vm_area_struct *vma)
 609 {
 610         struct inode *inode;
 611
 612         struct writeback_control wbc = {
 613                 .nr_to_write = LONG_MAX,
 614                 .sync_mode = WB_SYNC_ALL,
 615                 .range_start = vma->vm_pgoff * PAGE_SIZE,
 616                  /* absolute end, byte at end included */
 617                 .range_end = vma->vm_pgoff * PAGE_SIZE +
 618                         (vma->vm_end - vma->vm_start - 1),
 619         };
 620
 621         if (!(vma->vm_flags & VM_SHARED))
 622                 return;
 623
 624         p9_debug(P9_DEBUG_VFS, "9p VMA close, %p, flushing", vma);
 625
 626         inode = file_inode(vma->vm_file);
 627
 628         if (!mapping_cap_writeback_dirty(inode->i_mapping))
 629                 wbc.nr_to_write = 0;
 630
 631         might_sleep();
 632         sync_inode(inode, &wbc);
 633 }
 634
 635
 636 static const struct vm_operations_struct v9fs_file_vm_ops = {
 637         .fault = filemap_fault,
 638         .map_pages = filemap_map_pages,
 639         .page_mkwrite = v9fs_vm_page_mkwrite,
 640 };
 641
 642 static const struct vm_operations_struct v9fs_mmap_file_vm_ops = {
 643         .close = v9fs_mmap_vm_close,
 644         .fault = filemap_fault,
 645         .map_pages = filemap_map_pages,
 646         .page_mkwrite = v9fs_vm_page_mkwrite,
 647 };
 648
 649
 650 const struct file_operations v9fs_cached_file_operations = {
 651         .llseek = generic_file_llseek,
 652         .read_iter = generic_file_read_iter,
 653         .write_iter = generic_file_write_iter,
 654         .open = v9fs_file_open,
 655         .release = v9fs_dir_release,
 656         .lock = v9fs_file_lock,
 657         .mmap = v9fs_file_mmap,
 658         .fsync = v9fs_file_fsync,
 659 };
 660
 661 const struct file_operations v9fs_cached_file_operations_dotl = {
 662         .llseek = generic_file_llseek,
 663         .read_iter = generic_file_read_iter,
 664         .write_iter = generic_file_write_iter,
 665         .open = v9fs_file_open,
 666         .release = v9fs_dir_release,
 667         .lock = v9fs_file_lock_dotl,
 668         .flock = v9fs_file_flock_dotl,
 669         .mmap = v9fs_file_mmap,
 670         .fsync = v9fs_file_fsync_dotl,
 671 };
 672
 673 const struct file_operations v9fs_file_operations = {
 674         .llseek = generic_file_llseek,
 675         .read_iter = v9fs_file_read_iter,
 676         .write_iter = v9fs_file_write_iter,
 677         .open = v9fs_file_open,
 678         .release = v9fs_dir_release,
 679         .lock = v9fs_file_lock,
 680         .mmap = generic_file_readonly_mmap,
 681         .fsync = v9fs_file_fsync,
 682 };
 683
 684 const struct file_operations v9fs_file_operations_dotl = {
 685         .llseek = generic_file_llseek,
 686         .read_iter = v9fs_file_read_iter,
 687         .write_iter = v9fs_file_write_iter,
 688         .open = v9fs_file_open,
 689         .release = v9fs_dir_release,
 690         .lock = v9fs_file_lock_dotl,
 691         .flock = v9fs_file_flock_dotl,
 692         .mmap = generic_file_readonly_mmap,
 693         .fsync = v9fs_file_fsync_dotl,
 694 };
 695
 696 const struct file_operations v9fs_mmap_file_operations = {
 697         .llseek = generic_file_llseek,
 698         .read_iter = v9fs_mmap_file_read_iter,
 699         .write_iter = v9fs_mmap_file_write_iter,
 700         .open = v9fs_file_open,
 701         .release = v9fs_dir_release,
 702         .lock = v9fs_file_lock,
 703         .mmap = v9fs_mmap_file_mmap,
 704         .fsync = v9fs_file_fsync,
 705 };
 706
 707 const struct file_operations v9fs_mmap_file_operations_dotl = {
 708         .llseek = generic_file_llseek,
 709         .read_iter = v9fs_mmap_file_read_iter,
 710         .write_iter = v9fs_mmap_file_write_iter,
 711         .open = v9fs_file_open,
 712         .release = v9fs_dir_release,
 713         .lock = v9fs_file_lock_dotl,
 714         .flock = v9fs_file_flock_dotl,
 715         .mmap = v9fs_mmap_file_mmap,
 716         .fsync = v9fs_file_fsync_dotl,
 717 };